Add static assert to pre c++11 subspan

mike919192 · Feb 15, 2024 · 8bad0ea · 8bad0ea
1 parent f35ebfa
commit 8bad0ea
Showing 1 changed file with 6 additions and 0 deletions.
diff --git a/include/etl/span.h b/include/etl/span.h
@@ -354,6 +354,12 @@ namespace etl
     template <size_t OFFSET, size_t COUNT>
     etl::span<element_type, COUNT != etl::dynamic_extent ? COUNT : Extent - OFFSET> subspan() const
     {
+      //if extent is static, check that OFFSET is within the original span
+      ETL_STATIC_ASSERT((extent != etl::dynamic_extent) ? OFFSET <= extent : true, "OFFSET is not within the original span");
+
+      //if count is also static, check that OFFSET + COUNT is within the original span
+      ETL_STATIC_ASSERT((extent != etl::dynamic_extent) && (COUNT != etl::dynamic_extent) ? COUNT <= (extent - OFFSET) : true, "OFFSET + COUNT is not within the original span");
+
       if (COUNT == etl::dynamic_extent)
       {
         return etl::span<element_type, (COUNT != etl::dynamic_extent ? COUNT : Extent - OFFSET)>(pbegin + OFFSET, (pbegin + Extent));